Radeon HD 6950 Power Supply?

I just bought a Sapphire Radeon HD 6950 2gb and a Rosewill 550W ATX12V / EPS12V Power Supply. When I connect both of the 6 pin PCI-E connectors from the psu to the gpu and try to run the computer, it starts for a second and shuts down. I did the paper clip test and the psu was working fine. I used a wattage calculator online and it seemed that I only needed roughly 500W to run the whole rig and was under the impression that 550W PSU would be ok... should I get a higher wattage psu? I searched the forums and people were suggesting psu from 550W to 850W for the gpu so I am not sure if I am not connecting everything correctly or if I need to buy another psu.

I have:
AMD Phenom II X4 965 3.4ghz
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103727&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=3938566&SID=

ASUS M5A78L-M LX PLUS Micro ATX motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131795&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=3938566&SID=

Rosewill HIVE 550
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182131&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=3938566&SID=

Sapphire Radeon HD 6950 2GB Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102954&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-Video%20Cards-_-Sapphire%20Tech-_-14102954&AID=10440897&PID=3938566&SID=

Thank you for the help!
9 answers Last reply
More about radeon 6950 power supply
  1. Hi

    That rosewill unit isn't great but should still be enough for your system, I would check all the connections again (24pin, EPS 4/8 pin, PCI-E 6 pins, Sata power ETC....)
  2. Don't go with the Rosewill. I have the same graphics card and I run it with CM 700w PSU.

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817171054

    Works great. Go for it! :)
  3. Just to add, you don't need a 700W PSU, A High end 500W unit from Corsair, Seasonic, silverstone ETC... would be plenty.
  4. Rustyy117 said:
    Just to add, you don't need a 700W PSU, A High end 500W unit from Corsair, Seasonic, silverstone ETC... would be plenty.


    +1

    But I'd still recommend something higher than 500.
  5. arzbhatia said:
    Don't go with the Rosewill. I have the same graphics card and I run it with CM 700w PSU.

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817171054

    Works great. Go for it! :)
    You must have a great angel watching over you because your psu is Tier 4 - Not Recommend for stressful situations. May not be able to put out full rated power above room temperature, and may slightly fail to meet ATX specs. http://www.eggxpert.com/forums/thread/323050.aspx OP i highly recommend you avoid the crap master psu i recommend this one for your build http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013 it's built by seasonic ;)
  6. regina_49 said:
    You must have a great angel watching over you because your psu is Tier 4 - Not Recommend for stressful situations. May not be able to put out full rated power above room temperature, and may slightly fail to meet ATX specs. http://www.eggxpert.com/forums/thread/323050.aspx OP i highly recommend you avoid the crap master psu i recommend this one for your build http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013 it's built by seasonic ;)



    oh haha. I don't have that one, the one I linked. :-/ I have some other one.
  7. arzbhatia said:
    oh haha. I don't have that one, the one I linked. :-/ I have some other one.
    oh o.k. thank goodness for that then :)
  8. OP here. If my power supply is enough to power this then I am not sure what is wrong.
    Another thing is my mother board will not post (no beep) even with integrated graphics card. So my mobo might be bad as well.

    I tried to connect the gpu into another computer that works with a 500W psu and the same thing happened: all the fans spin for a second, the system comes on for a second and then shuts down.

    Another thing that was weird was the when I connected one 6 pin from PSU to GPU, and another one from GPU to a 120mm fan that is not connected to anything, the system runs but still doesn't display anything on the monitor (and still no beep from mobo).

    I am supposed to connect both the 6 pin connector directly in the PSU, correct?

    From this, I am thinking maybe my mobo is bad AND my gpu is bad. (or maybe I need a more powerful PSU?) Any suggestions?
  9. Oh damn! I didn't see the motherboard you got there. The PSU seems fine. The mobo seems funny to me.
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